Wow, the competition in that field is severe...
One that pops into my mind is the "Life - How did it get here?" book (the blue one). It is full of quotes by a guy that the WT referred to as 'evolutionist' but really was a paranormal TV guy. And full of quote mining. It is the definition of pure, good old creationist crazy literature.
There was another book about the prophecy of Ezekiel, I don't remember its title. That was also a strong candidate.
Of course, the Revelation book is one that reeks of craziness. The only rational explanation for that piece of art is that the authors were really high, completely stoned, when they wrote it.